[noodle]

I don't know what the situation is in Japan, but I am assuming it is similar to the UK... In the UK, at least London anyway, what they offered you, can usually be a starting salary for an engineer in IT. If I were in your position, I would take a salary that is higher than my previous job AND make sure that there are oportunities for a pay rise within the company. ie, insentives, or targets etc etc.